He won a gold medal in the men's 4 × 400 metres relay at the 2000 Summer Olympics in Sydney, Australia.

In 2008, the 2000 Sydney Olympics 4×400 metres relay US team was stripped of their medals after teammate Antonio Pettigrew admitted that he had used performance-enhancing drugs.

[2] Calvin Harrison did not participate in the 2004 Summer Olympics due to a stimulant violation involving modafinil at the 2003 U.S. championships.

[7] Due to family problems, Alvin and Calvin Harrison lived on their own since their junior year in high school, floating back and forth between Orlando, Florida, and Salinas, California.

After graduation, Calvin Harrison attended two-year Hartnell College, but did not compete in track.